Identify the medium for each of the following waves: ocean waves, earthquake waves, and sound waves from a speaker

Ocean Waves . . . . . the water in the ocean

Earthquake Waves . . . the rock and everything else that the Earth is made of

Sound waves from a speaker . . . the air in the room

The modern-day generator works on the principle of electromagnetic induction discovered by michael faraday in 1831-32. faraday discovered that the above flow of electric charges could be induced by moving an electrical conductor, such as a wire that contains electric charges, in a magnetic field.